SANTA CLARA -- The 49ers on Friday got their first on-field look at the players they selected in the NFL draft last month, as well as a slew of undrafted free agent-signees, on the first day of the team's rookie mini camp.

All 11 players drafted by the 49ers were on the field Friday, though wide receiver Quinton Patton has to leave after the final practice Sunday and can't return until his college class graduates.

"Excitement's in the air," 49ers coach Jim Harbaugh said after the morning practice. "Our team got bigger. There's more of us. These guys look really good. They look like football players. ... I'm very pleased."

The assembled rookies and eligible first-year players healthy enough to do so will practice through Sunday.

A handful of players haven't been cleared to practice yet. Four of the 11 players drafted by the 49ers received extensive medical evaluations Thursday, Harbaugh said. He liked what he heard from the results.

For now, the focus is getting the young players up to speed and ready to blend in well when the veterans join the fray for the next mini camp, Harbaugh said.

"Our goal is to get our guys ready for when the veterans come in here, give them a chance to make the football team and evaluate," Harbaugh said. "We don't want to cut anybody. We don't want to cut anybody that's going to come back and beat us on another football team eventually. A lot of excitement, a lot to be done.